feat/refacto: improve configurations

- You should now get the configs through functions
- Configs for languages are now inside a local object called parsers
- You can get the parser installation configurations with `get_parser_configs`
- A new object has been initialized inside configs to specify module config (called config).
- Provide functions to enable/disable a module on one buffer
- Provide functions to enable/disable a module on all buffers, and if filetype is
  specified, for specific filetype
- Provide function to determine if module is activated for a specified filetype

lua/nvim-treesitter/highlight.lua

@@ -1,12 +1,12 @@
 local api = vim.api
-local queries = require'nvim-treesitter.query'
 local ts = vim.treesitter
+local queries = require'nvim-treesitter.query'
 
 local M = {
-  highlighters={}
+  highlighters = {}
 }
 
-function M.setup(bufnr, ft)
+function M.attach(bufnr, ft)
   local buf = bufnr or api.nvim_get_current_buf()
   local ft = ft or api.nvim_buf_get_option(buf, 'ft')
 
@@ -16,4 +16,13 @@ function M.setup(bufnr, ft)
   M.highlighters[buf] = ts.TSHighlighter.new(query, buf, ft)
 end
 
+function M.detach(bufnr)
+  local buf = bufnr or api.nvim_get_current_buf()
+  if M.highlighters[buf] then
+    M.highlighters[buf]:set_query("")
+    M.highlighters[buf] = nil
+  end
+  api.nvim_buf_set_option(buf, 'syntax', 'on')
+end
+
 return M